SHS IV (Speech Enhancement) This unit is built with the same characteristics as the SHS III but is programmed with Speech Enhancement software. This means better clarity in the "speech" range for understanding conversation in the field.

This unit will also have an additional memory programmed into its circuit to reduce unwanted background sounds and wind noise. The memories will switch as follows - 1) enhancement-protection, 2) background reduction enhancement-protection, 3) active telecoil/enhancement-protection, 4) mute. Again, these units will also need to work with an induction loop system in order to understand and hear the radio traffic correctly in the "wireless-telecoil" mode. They can also be used in a "hard wired" configuration if desired.